CN110972044A - Loudspeaker control circuit and audio playing device - Google Patents
Loudspeaker control circuit and audio playing device Download PDFInfo
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- CN110972044A CN110972044A CN201911425532.9A CN201911425532A CN110972044A CN 110972044 A CN110972044 A CN 110972044A CN 201911425532 A CN201911425532 A CN 201911425532A CN 110972044 A CN110972044 A CN 110972044A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Abstract
The invention discloses a loudspeaker control circuit and electronic equipment, wherein the loudspeaker control circuit comprises a main control unit, a power amplifier, a voltage detection circuit, a current detection circuit and an analog-to-digital conversion circuit, the main control unit outputs an audio signal, the power amplifier amplifies the power of the audio signal to a loudspeaker, and the voltage detection circuit detects the output voltage of the power amplifier. The current detection circuit detects an output current of the power amplification unit. The analog-to-digital conversion circuit converts the detection current and the detection voltage into corresponding digital detection current signals and digital detection voltage signals and outputs the digital detection current signals and the digital detection voltage signals to the main control unit so as to feed back and adjust the audio signals output by the main control unit. The invention is used for solving the technical problem that the loudspeaker unit cannot be accurately controlled.
Description
Technical Field
The present invention relates to the field of electronic devices, and in particular, to a speaker control circuit and an audio playback apparatus.
Background
The current market audio power amplifier protection scheme mainly focuses on power amplification and front-end signal processing. For the use and protection of the loudspeaker, a parameter scheme is modified by pre-modeling, and the phenomenon of inconsistent actual output and modeling prediction is easily caused. When the medium and high power is output, the loudspeaker unit cannot be accurately controlled, and the problems that the loudspeaker unit is burnt out due to overheating and the THD (total harmonic distortion) is too high due to too large amplitude are easily caused.
Disclosure of Invention
The invention mainly aims to provide a loudspeaker control circuit, aiming at solving the technical problem that a loudspeaker unit cannot be accurately controlled.
To achieve the above object, the present invention provides a speaker control circuit for controlling a speaker, the speaker control circuit comprising:
the main control unit is used for outputting audio signals;
a power amplifier for power amplifying the audio signal to the speaker;
a voltage detection circuit for detecting an output voltage of the power amplifier;
a current detection circuit for detecting an output current of the power amplifier;
and the analog-to-digital conversion circuit is used for converting the detection current and the detection voltage into corresponding digital detection current signals and digital detection voltage signals and outputting the digital detection current signals and the digital detection voltage signals to the main control unit so as to feed back and adjust the audio signals output by the main control unit.
Optionally, the main control unit has a feedback signal input terminal and an audio signal output terminal, the voltage detection circuit has a forward input terminal, a reverse input terminal, a forward output terminal and a reverse output terminal, the current detection circuit has a first detection terminal, a second detection terminal and an output terminal, the input terminal of the power amplifier is connected to the audio signal output terminal of the main control unit, the forward output terminal of the power amplifier is connected to the first detection terminal of the current detection terminal, and the reverse output terminal of the power amplifier, the reverse input terminal of the voltage detection circuit and the reverse input terminal of the speaker are interconnected; the second detection end of the current detection end, the positive input end of the loudspeaker and the positive input end of the voltage detection circuit are interconnected, and the output end of the current detection circuit is connected with the current acquisition end of the analog-to-digital conversion circuit; the forward output end of the voltage detection circuit is connected with the forward voltage acquisition end of the analog-to-digital conversion circuit, and the reverse output end of the voltage detection circuit is connected with the reverse voltage acquisition end of the analog-to-digital conversion circuit; and the output end of the analog-to-digital conversion circuit is connected with the feedback signal input end of the main control unit.
Optionally, the speaker control circuit further includes a low-pass filter circuit, the low-pass filter circuit is disposed between the voltage detection circuit and the analog-to-digital conversion circuit, the low-pass filter circuit has a forward input end, a backward input end, a forward output end and a backward output end, the forward input end of the low-pass filter circuit is connected to the forward output end of the voltage detection circuit, the backward input end of the low-pass filter circuit is connected to the backward output end of the voltage detection circuit, the forward output end of the low-pass filter circuit is connected to the forward voltage collection end of the analog-to-digital conversion circuit, and the backward output end of the low-pass filter circuit is connected to the backward voltage collection end of the analog-to-digital conversion circuit;
the low-pass filter circuit is used for filtering high-frequency noise in the detection voltage.
Optionally, the power amplifier is a medium power audio power amplifier and/or a high power audio power amplifier.
Optionally, the voltage detection circuit includes a first resistor, a second resistor, a third resistor, and a fourth resistor, a first end of the first resistor is a forward input end of the voltage detection circuit, a second end of the first resistor is connected to a first end of the second resistor, and a connection node thereof is a forward output end of the voltage detection circuit; the first end of the third resistor is the reverse input end of the voltage detection circuit, the second end of the third resistor is connected with the first end of the fourth resistor, and the connection node of the third resistor is the reverse output end of the voltage detection circuit; a second terminal of the fourth resistor and a second terminal of the second resistor are grounded.
Optionally, the current detection circuit includes a fifth resistor and a first chip, the first chip includes a first detection pin, a second detection pin and an output pin, the first detection pin of the first chip is connected to the first end of the fifth resistor, and its connection node is the first detection end of the current detection circuit, the second detection pin of the first chip is connected to the second end of the fifth resistor, and its connection node is the second detection end of the current detection circuit, and the output pin of the first chip is the output end of the current detection circuit.
Optionally, the low-pass filter circuit includes a first capacitor, a second capacitor, a third capacitor, a sixth resistor, and a seventh resistor, a first end of the first capacitor is connected to a first end of the second capacitor, a connection node of the first capacitor is a forward input end of the low-pass filter circuit, a second end of the first capacitor is connected to a first end of the third capacitor, and a connection node of the first capacitor is a reverse input end of the low-pass filter circuit; the second end of the second capacitor is connected with the first end of the sixth resistor, and the connection node of the second capacitor is the positive output end of the low-pass filter circuit; the second end of the third capacitor is connected with the first end of the seventh resistor, and the connection node of the third capacitor is the reverse output end of the low-pass filter circuit; a second terminal of the sixth resistor and a second terminal of the seventh resistor are grounded.
Optionally, the analog-to-digital conversion circuit is a multi-channel real-time audio conversion chip.
Optionally, the model of the multi-channel real-time audio conversion chip is ES 7243.
In order to achieve the above object, the present invention further provides an audio playing apparatus, which includes the speaker control circuit as described above.
The speaker control circuit is provided with a main control unit, a power amplifier, a voltage detection circuit, a current detection circuit and an analog-to-digital conversion circuit, wherein the main control unit outputs an audio signal, and the power amplifier amplifies the power of the audio signal to the speaker. A voltage detection circuit detects an output voltage of the power amplifier, and a current detection circuit detects an output current of the power amplifier. The analog-to-digital conversion circuit converts the detection current and the detection voltage into corresponding digital detection current signals and digital detection voltage signals and outputs the digital detection current signals and the digital detection voltage signals to the main control unit so as to feed back and adjust the audio signals output by the main control unit. Therefore, the feedback circuit consisting of the voltage detection circuit, the current detection circuit and the analog-to-digital conversion circuit is arranged outside the power amplifier, so that the audio signal is fed back and adjusted, the size of the audio signal after the power amplification of the power amplifier is controlled, the audio signal required to be played by the loudspeaker is accurately controlled, and the performance of the product is fully improved. Because the feedback circuit is an external circuit, the performance of the conventional audio amplifier is not influenced. And the improved loudspeaker control circuit has lower cost and small occupied space. The low-frequency submergence and sound pressure level lifting function under the small size can be achieved, and meanwhile nonlinear compensation can be supported.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of a speaker control circuit according to the present invention;
fig. 2 is a circuit diagram of a speaker control circuit according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a loudspeaker control circuit, which is used for solving the technical problem that a loudspeaker unit cannot be accurately controlled.
In an exemplary technology, the conventional medium-high power audio scheme does not support the internal current signal I and voltage signal V back-sampling function, mainly because the back-sampling of the current signal I and the voltage signal V under a large current causes an excessively large integrated design volume and excessively high heat generation of a power amplifier or an audio power amplifier chip, thereby affecting the stability of a product. Miniature audio power amplifier or audio power amplifier chip integrated current signal I, voltage signal V signal back production, but can only accomplish single channel feedback, and power can only reach 20W, are difficult to satisfy current stereo set technical requirement.
In one embodiment, as shown in fig. 1, a speaker control circuit is provided for controlling a speaker 30, where the speaker 30 control circuit includes a main control unit 10, a power amplifier 20, a voltage detection circuit 50, a current detection circuit 40, and an analog-to-digital conversion circuit 60, where the main control unit 10 outputs an audio signal, and the power amplifier 20 performs power amplification on the audio signal and outputs the audio signal to the speaker 30. The voltage detection circuit 50 detects the output voltage of the power amplifier 20, and the current detection circuit 40 detects the output current of the power amplifier 20. The analog-to-digital conversion circuit 60 converts the detection current output by the current detection circuit 40 and the detection voltage output by the voltage detection circuit 50 into corresponding digital detection current signals and digital detection voltage signals, and outputs the digital detection current signals and digital detection voltage signals to the main control unit 10 to feedback and regulate the audio signals output by the main control unit 10. Therefore, the feedback circuit consisting of the voltage detection circuit 50, the current detection circuit 40 and the analog-to-digital conversion circuit 60 is arranged outside the power amplifier 20, so that the audio signal is fed back and adjusted, the size of the audio signal after power amplification of the power amplifier 20 is controlled, the audio signal required to be played by the loudspeaker 30 is accurately controlled, and the product performance is fully improved. Because the feedback circuit is an external circuit, the performance of the conventional audio amplifier is not influenced. The improved loudspeaker 30 control circuit has lower cost and small occupied space. The low-frequency submergence and sound pressure level lifting function under the small size can be achieved, and meanwhile nonlinear compensation can be supported. Moreover, the external extraction technology provided by the patent can meet the extraction of the current signal I and the voltage signal V above 20W, and the design requirement of a medium-high power sound box on Smart PA (audio chip) is made up. Meanwhile, the range of the model selection of the power amplifier 20 or the audio power amplifier 20 chip can be expanded, and feedback regulation can be added on the basis of not changing the existing circuit, so that the protection of the loudspeaker 30 is realized.
It should be noted that any connection relationship for implementing signal transmission among the functional circuits described above is applicable, and is not limited, in this embodiment, the following connection relationship is adopted to implement signal transmission among the functional circuits described above, the main control unit 10 has a feedback signal input end and an audio signal output end, the voltage detection circuit 50 has a forward input end, a reverse input end, a forward output end and a reverse output end, the current detection circuit 40 has a first detection end, a second detection end and an output end, the input end of the power amplifier 20 is connected with the audio signal output end of the main control unit 10, the forward output end of the power amplifier 20 is connected with the first detection end of the current detection end, and the reverse output end of the power amplifier 20, the reverse input end of the voltage detection circuit 50 and the reverse input end of the speaker 30 are interconnected; the second detection end of the current detection end, the positive input end of the loudspeaker 30 and the positive input end of the voltage detection circuit 50 are interconnected, and the output end of the current detection circuit 40 is connected with the current collection end of the analog-to-digital conversion circuit 60; the forward output end of the voltage detection circuit 50 is connected with the forward voltage acquisition end of the analog-to-digital conversion circuit 60, and the reverse output end of the voltage detection circuit 50 is connected with the reverse voltage acquisition end of the analog-to-digital conversion circuit 60; an output terminal of the analog-to-digital conversion circuit 60 is connected to a feedback signal input terminal of the main control unit 10.
In one embodiment, as shown in fig. 2, the control circuit of the speaker 30 further includes a low-pass filter circuit 70, the low-pass filter circuit 70 is disposed between the voltage detection circuit 50 and the analog-to-digital conversion circuit 60, the low-pass filter circuit 70 has a forward input terminal, an inverse input terminal, a forward output terminal and an inverse output terminal, the forward input terminal of the low-pass filter circuit 70 is connected to the forward output terminal of the voltage detection circuit 50, the inverse input terminal of the low-pass filter circuit 70 is connected to the inverse output terminal of the voltage detection circuit 50, the forward output terminal of the low-pass filter circuit 70 is connected to the forward voltage collecting terminal of the analog-to-digital conversion circuit 60, and the inverse output terminal of the low-pass filter circuit 70 is connected to the.
The low-pass filter circuit 70 filters high-frequency noise in the detection voltage.
In an embodiment, in order to avoid the phenomena that the stability of the product is affected by too large design volume, too high heat, and the like, which may be caused by adding a feedback loop to the audio power amplifier 20, the power amplifier 20 is a medium-power audio power amplifier 20 and/or a high-power audio power amplifier 20.
At this time, a feedback loop composed of the voltage detection circuit 50, the current detection circuit 40 and the analog-to-digital conversion circuit 60 is provided outside the medium power audio power amplifier 20 and/or the high power audio power amplifier 20, so that the speaker 30 can be protected without changing the original audio power amplifier 20, and the phenomenon that the product stability is affected by volume increase, heat generation and the like due to the addition of the feedback loop to the audio power amplifier 20 can be avoided.
In an embodiment, as shown in fig. 2, the voltage detection circuit 50 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, a first end of the first resistor R1 is a forward input end of the voltage detection circuit 50, a second end of the first resistor R1 is connected to a first end of the second resistor R2, and a connection node thereof is a forward output end of the voltage detection circuit 50; a first end of the third resistor R3 is an inverted input end of the voltage detection circuit 50, a second end of the third resistor R3 is connected with a first end of the fourth resistor R4, and a connection node thereof is an inverted output end of the voltage detection circuit 50; the second terminal of the fourth resistor R4 and the second terminal of the second resistor R2 are grounded.
The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 adopt a high-precision resistor voltage division scheme, and when the circuit is designed, the sizes of the first resistor R1 and the second resistor R2 and the sizes of the third resistor R3 and the fourth resistor R4 are adjusted according to different output voltage ranges of the audio power amplifier 20. At this time, V _ sensor + is the forward detection voltage, V _ out + is the forward output voltage of the audio power amplifier 20, R2 is the resistance value of the second resistor R2, R1 is the resistance value of the first resistor R1, and V _ sensor + is V _ out + R2/(R1+ R2).
V _ sensor-is the reverse detection voltage, V _ out-is the reverse output voltage of the audio power amplifier 20, R4 is the resistance of the fourth resistor R4, R3 is the resistance of the third resistor R3, and V _ sensor-is V _ out-R4/(R3 + R4).
In an embodiment, the current detection circuit 40 includes a fifth resistor R5 and a first chip U1, the first chip U1 includes a first detection pin In +, a second detection pin In-, and an output pin out, the first detection pin In + of the first chip U1 is connected to a first end of the fifth resistor R5, a connection node thereof is a first detection end of the current detection circuit 40, the second detection pin In-of the first chip U1 is connected to a second end of the fifth resistor R5, a connection node thereof is a second detection end of the current detection circuit 40, and the output pin out of the first chip U1 is an output end of the current detection circuit 40.
When the signal from the power amplifier 20 passes through the fifth resistor R5, a weak voltage Vr5 is generated across the fifth resistor R5, the voltage is proportional to the resistance R5 of the selected fifth resistor R5, I _ out is the output current of the power amplifier 20, and Vr5 is I _ out R5. The R5 resistance value may be selected from 10m ohm to 250m ohm as desired.
Alternatively, the first chip U1 is a high-precision current detection amplifier AD8418, and in the above embodiment, the voltage Vr5 is input to the high-precision current detection amplifier AD8418, and the AD8418 fixes the voltage Vr5 across the 20 times amplified Rs, so that the detection current V _ i sensor is 20 × Vr 5.
In an embodiment, the low-pass filter circuit 70 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a sixth resistor R6, and a seventh resistor R7, a first end of the first capacitor C1 is connected to a first end of the second capacitor C2, a connection node of the first capacitor C3538 is a positive input terminal of the low-pass filter circuit 70, a second end of the first capacitor C1 is connected to a first end of the third capacitor C3, and a connection node of the first capacitor C1 is a negative input terminal of the low-pass filter circuit 70; a second end of the second capacitor C2 is connected to a first end of the sixth resistor R6, and a connection node thereof is a positive output end of the low-pass filter circuit 70; a second end of the third capacitor C3 is connected to a first end of the seventh resistor R7, and a connection node thereof is an inverted output end of the low-pass filter circuit 70; a second terminal of the sixth resistor R6 and a second terminal of the seventh resistor R7 are coupled to ground.
The second capacitor C2 and the sixth resistor R6 form a low-pass filter for filtering high-frequency noise of the forward detection voltage, and the third capacitor C3 and the seventh resistor R7 form a low-pass filter for filtering high-frequency noise of the reverse detection voltage. The first capacitor C1 provides isolation between the forward sense voltage and the reverse sense voltage to prevent the two sense voltages from interfering with each other.
Optionally, the analog-to-digital conversion circuit 60 is a multi-channel real-time audio conversion chip U2 for convenient and fast analog-to-digital conversion.
Optionally, the model of the multi-channel real-time audio conversion chip U2 is ES 7243.
The sampled current signal I and voltage signal V are converted into digital signals in the format of I2S through the ES7243, and the digital signals are forwarded to the main control unit 10. The main control unit 10 may obtain an original power amplifier output signal through data restoration.
Optionally, the main control unit 10 may be implemented by using an existing MCU, and existing data processing software is loaded to facilitate processing of the feedback current signal I and the feedback voltage signal V.
The principle of the invention is explained below with reference to fig. 1 and 2:
the MCU outputs an audio signal, the power amplifier 20 performs power amplification on the audio signal to respectively output a forward audio signal and a reverse audio signal, then the forward audio signal passes through a fifth resistor R5 and then is output to the loudspeaker, a weak voltage Vr5 is generated at two ends of the fifth resistor R5, the voltage is in direct proportion to a resistance value R5 of a selected fifth resistor R5, I _ out is the output current of the power amplifier 20, Vr5 is I _ out R5, the voltage Vr5 is input to the high-precision current detection amplifier AD8418, the voltage Vr5 at two ends of 20 times of the amplified Rs is fixed by the AD8418, and therefore the detection current V _ I sensor 20 is obtained as Vr 5.
The first resistor R1 and the second resistor R2 perform high-precision resistance voltage division on the forward audio signal, at this time, V _ sensor + obtained by the AD8418 is a forward detection voltage, V _ out + is a forward output voltage of the audio power amplifier 20, R2 is a resistance value of the second resistor R2, R1 is a resistance value of the first resistor R1, and V _ sensor + ═ V _ out +/R2/(R1 + R2).
The third resistor R3 and the fourth resistor R4 perform high-precision resistance voltage division on the inverted audio signal. At this time, V _ sensor "is the reverse detection voltage, V _ out" is the reverse output voltage of the audio power amplifier 20, R4 is the resistance of the fourth resistor R4, R3 is the resistance of the third resistor R3, and V _ sensor "is V _ out" R4/(R3+ R4).
The state of the loudspeaker unit is reflected in real time by the process, the temperature of the loudspeaker can be reflected by matching with current estimation or a temperature sensor, accurate displacement control can be carried out on the loudspeaker, and the product performance is fully improved. Because the feedback circuit is an external circuit, the performance of the existing audio power amplifier chip is not influenced, and the model selection range of the chip can be enlarged. And the improved whole circuit has lower cost and small occupied space. The audio signal that sampled voltage, electric current that the cooperation laboratory test obtained correspond adjusts the relation, and MCU adjusts audio signal, can reach low frequency dive and sound pressure level promotion effect under the small volume, can support nonlinear compensation simultaneously.
In order to solve the above problem, the present invention further provides an audio playing apparatus, which includes the control circuit of the speaker 30 as described above.
It should be noted that, since the audio playback apparatus of the present invention includes all embodiments of the control circuit of the speaker 30, the audio playback apparatus of the present invention has all the advantages of the control circuit of the speaker 30, and the description thereof is omitted here.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A speaker control circuit for controlling a speaker, the speaker control circuit comprising:
the main control unit is used for outputting audio signals;
a power amplifier for power amplifying the audio signal to the speaker;
a voltage detection circuit for detecting an output voltage of the power amplifier;
a current detection circuit for detecting an output current of the power amplifier;
and the analog-to-digital conversion circuit is used for converting the detection current and the detection voltage into corresponding digital detection current signals and digital detection voltage signals and outputting the digital detection current signals and the digital detection voltage signals to the main control unit so as to feed back and adjust the audio signals output by the main control unit.
2. The speaker control circuit as claimed in claim 1, wherein the main control unit has a feedback signal input terminal and an audio signal output terminal, the voltage detection circuit has a forward input terminal, a reverse input terminal, a forward output terminal and a reverse output terminal, the current detection circuit has a first detection terminal, a second detection terminal and an output terminal, the input terminal of the power amplifier is connected to the audio signal output terminal of the main control unit, the forward output terminal of the power amplifier is connected to the first detection terminal of the current detection terminal, and the reverse output terminal of the power amplifier, the reverse input terminal of the voltage detection circuit and the reverse input terminal of the speaker are interconnected; the second detection end of the current detection end, the positive input end of the loudspeaker and the positive input end of the voltage detection circuit are interconnected, and the output end of the current detection circuit is connected with the current acquisition end of the analog-to-digital conversion circuit; the forward output end of the voltage detection circuit is connected with the forward voltage acquisition end of the analog-to-digital conversion circuit, and the reverse output end of the voltage detection circuit is connected with the reverse voltage acquisition end of the analog-to-digital conversion circuit; and the output end of the analog-to-digital conversion circuit is connected with the feedback signal input end of the main control unit.
3. The speaker control circuit as claimed in claim 2, wherein the speaker control circuit further comprises a low pass filter circuit, the low pass filter circuit is disposed between the voltage detection circuit and the analog-to-digital conversion circuit, the low pass filter circuit has a forward input terminal, a backward input terminal, a forward output terminal and a backward output terminal, the forward input terminal of the low pass filter circuit is connected to the forward output terminal of the voltage detection circuit, the backward input terminal of the low pass filter circuit is connected to the backward output terminal of the voltage detection circuit, the forward output terminal of the low pass filter circuit is connected to the forward voltage collecting terminal of the analog-to-digital conversion circuit, and the backward output terminal of the low pass filter circuit is connected to the backward voltage collecting terminal of the analog-to-digital conversion circuit;
the low-pass filter circuit is used for filtering high-frequency noise in the detection voltage.
4. The speaker control circuit as claimed in claim 1, wherein the power amplifier is a medium power audio power amplifier and/or a high power audio power amplifier.
5. The speaker control circuit according to claim 2, wherein the voltage detection circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor, a first end of the first resistor is a forward input end of the voltage detection circuit, a second end of the first resistor is connected with a first end of the second resistor, and a connection node thereof is a forward output end of the voltage detection circuit; the first end of the third resistor is the reverse input end of the voltage detection circuit, the second end of the third resistor is connected with the first end of the fourth resistor, and the connection node of the third resistor is the reverse output end of the voltage detection circuit; a second terminal of the fourth resistor and a second terminal of the second resistor are grounded.
6. The speaker control circuit according to claim 2, wherein the current detection circuit comprises a fifth resistor and a first chip, the first chip comprises a first detection pin, a second detection pin and an output pin, the first detection pin of the first chip is connected to a first end of the fifth resistor, a connection node thereof is a first detection end of the current detection circuit, the second detection pin of the first chip is connected to a second end of the fifth resistor, a connection node thereof is a second detection end of the current detection circuit, and the output pin of the first chip is an output end of the current detection circuit.
7. The speaker control circuit as claimed in claim 3, wherein the low-pass filter circuit comprises a first capacitor, a second capacitor, a third capacitor, a sixth resistor and a seventh resistor, a first terminal of the first capacitor is connected to a first terminal of the second capacitor, and a connection node thereof is a forward input terminal of the low-pass filter circuit, a second terminal of the first capacitor is connected to a first terminal of the third capacitor, and a connection node thereof is a backward input terminal of the low-pass filter circuit; the second end of the second capacitor is connected with the first end of the sixth resistor, and the connection node of the second capacitor is the positive output end of the low-pass filter circuit; the second end of the third capacitor is connected with the first end of the seventh resistor, and the connection node of the third capacitor is the reverse output end of the low-pass filter circuit; a second terminal of the sixth resistor and a second terminal of the seventh resistor are grounded.
8. A loudspeaker control circuit according to any one of claims 1 to 7 wherein the analogue to digital conversion circuit is a multi-channel real-time audio conversion chip.
9. The speaker control circuit of claim 6, wherein the multi-channel real-time audio conversion chip is model ES 7243.
10. An audio playback apparatus comprising a speaker control circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911425532.9A CN110972044A (en) | 2019-12-31 | 2019-12-31 | Loudspeaker control circuit and audio playing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911425532.9A CN110972044A (en) | 2019-12-31 | 2019-12-31 | Loudspeaker control circuit and audio playing device |
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| CN110972044A true CN110972044A (en) | 2020-04-07 |
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| CN201911425532.9A Pending CN110972044A (en) | 2019-12-31 | 2019-12-31 | Loudspeaker control circuit and audio playing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116055950A (en) * | 2022-05-11 | 2023-05-02 | 荣耀终端有限公司 | Speaker driving circuit and electronic device |
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2019
- 2019-12-31 CN CN201911425532.9A patent/CN110972044A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116055950A (en) * | 2022-05-11 | 2023-05-02 | 荣耀终端有限公司 | Speaker driving circuit and electronic device |
| CN116055950B (en) * | 2022-05-11 | 2023-10-17 | 荣耀终端有限公司 | Speaker driving circuit and electronic device |
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